For the Edu-trac I would like to present a use-case of Zentyal server, implemented in Aragon, Spain on 80 schools.
http://www.zentyal.com/press/80-zentyal-linux-servers-are-deployed-in-ar...

This project was with cooperation of Zentyal SL, the company behind the software, and the government of Aragon.

If possible, I will also present the integration of Schooltool (http://www.schooltool.org/) and Chamilo (http://www.chamilo.org) in Zentyal server.
Both can be demonstrated in a live environment.
The talk will be held in Dutch by me.